We knew this time was coming, but now it’s here: Call it the crossover point, when technologies like large-scale wind and solar come so far down the cost curve that they become cheaper than legacy sources of electric power generation. Cheaper than the old alternatives, in terms of making new investments. Cheaper, even, than keeping old power plants going, in some cases. And that time is now. You can see it in the latest estimates of lifetime costs of electricity from new power sources made by investment bank Lazard, and you can see it in the latest purchases of renewable power by utilities. Any way you look at it, advanced energy is winning.